#include "Chunk.h"
#include <cstdlib>

Chunk::Chunk(int chunkX, int chunkZ) : chunkX(chunkX), chunkZ(chunkZ)
{
    mesh = new Mesh*[HEIGHT_PARTIONS];
    for(int i = 0; i < HEIGHT_PARTIONS; i++)
    {
        mesh[i] = new Mesh(Mesh::COLOR | Mesh::NORMAL);
        dirty[i] = true;
    }
    for(int y = 0; y < HEIGHT; y++)
    {
        for(int x = 0; x < WIDTH; x++)
        {
            for(int z = 0; z < DEPTH; z++)
            {
                blocks[y][x][z] = (rand() < RAND_MAX / 2);
            }
        }
    }
}

Chunk::Chunk(const Chunk& orig)
{
}

Chunk::~Chunk()
{
    for(int i = 0; i < HEIGHT_PARTIONS; i++)
    {
        delete mesh[i];
    }
    delete[] mesh;
}

void Chunk::setBlock(int x, int y, int z, unsigned short block)
{
    blocks[y & BITMASK_HEIGHT][x & BITMASK_WIDTH][z & BITMASK_DEPTH] = block;
}

unsigned short Chunk::getBlock(int x, int y, int z)
{
    return blocks[y & BITMASK_HEIGHT][x & BITMASK_WIDTH][z & BITMASK_DEPTH];
}

void Chunk::renderTick(Shader& shader, DirectRenderer& dr, float lag)
{
    for(int i = 0; i < HEIGHT_PARTIONS; i++)
    {
        if(dirty[i])
        {
            buildChunk(i);
            dirty[i] = false;
        }
        mesh[i]->draw();
    }
}

void Chunk::buildChunk(int partionY)
{    
    cout << "BUILD " << partionY << endl;
    Mesh& m = *mesh[partionY];
    
    for(int y = 0; y < HEIGHT; y++)
    {
        for(int x = 0; x < WIDTH; x++)
        {
            for(int z = 0; z < DEPTH; z++)
            {
                if(blocks[y][x][z] == 1)
                {
                    for(int i = 0; i < 36; i++)
                    {
                        m.addColor(1, 0, 0, 1);
                    }
                    
                    // bottom
                    //m.addTexture(0.125f, 0.0f);
                    //m.addTexture(0.1875f, 0.0f);
                    //m.addTexture(0.125f, 0.0625f);
                    //m.addTexture(0.1875f, 0.0f);
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.125f, 0.0625f);
                    
                    for(int i = 0; i < 6; i++)
                    {
                        m.addNormal(0.0f, -1.0f, 0.0f);
                    }

                    m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                    m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 0.0f, z + 1.0f);
                    m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);

                    // top
                    //m.addTexture(0.25f, 0.0f);
                    //m.addTexture(0.25f, 0.0625f);
                    //m.addTexture(0.3125f, 0.0f);
                    //m.addTexture(0.3125f, 0.0f);
                    //m.addTexture(0.25f, 0.0625f);
                    //m.addTexture(0.3125f, 0.0625f);
                    
                    for(int i = 0; i < 6; i++)
                    {
                        m.addNormal(0.0f, 1.0f, 0.0f);
                    }

                    m.addPosition(x + 0.0f, y + 1.0f, z + 0.0f);
                    m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                    m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);

                    // right
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.25f, 0.0f);
                    //m.addTexture(0.25f, 0.0625f);
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.1875f, 0.0f);
                    //m.addTexture(0.25f, 0.0f);
                    
                    for(int i = 0; i < 6; i++)
                    {
                        m.addNormal(1.0f, 0.0f, 0.0f);
                    }

                    m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);
                    m.addPosition(x + 1.0f, y + 0.0f, z + 1.0f);
                    m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);

                    // left
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.25f, 0.0625f);
                    //m.addTexture(0.25f, 0.0f);
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.25f, 0.0f);
                    //m.addTexture(0.1875f, 0.0f);
                    
                    for(int i = 0; i < 6; i++)
                    {
                        m.addNormal(-1.0f, 0.0f, 0.0f);
                    }

                    m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                    m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                    m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                    m.addPosition(x + 0.0f, y + 1.0f, z + 0.0f);

                    // back
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.25f, 0.0625f);
                    //m.addTexture(0.25f, 0.0f);
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.25f, 0.0f);
                    //m.addTexture(0.1875f, 0.0f);
                    
                    for(int i = 0; i < 6; i++)
                    {
                        m.addNormal(0.0f, 0.0f, -1.0f);
                    }

                    m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                    m.addPosition(x + 1.0f, y + 0.0f, z + 1.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);
                    m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);
                    m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);

                    // front
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.25f, 0.0f);
                    //m.addTexture(0.25f, 0.0625f);
                    //m.addTexture(0.1875f, 0.0625f);
                    //m.addTexture(0.1875f, 0.0f);
                    //m.addTexture(0.25f, 0.0f);
                    
                    for(int i = 0; i < 6; i++)
                    {
                        m.addNormal(0.0f, 0.0f, 1.0f);
                    }

                    m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                    m.addPosition(x + 0.0f, y + 1.0f, z + 0.0f);
                    m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                }
            }
        }
    }
    
    m.build();  
}